Did a Huge 'Game of Thrones' Spoiler Just Leak About Jon Snow?

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Kit Harington, the actor who plays Jon Snow on "Game of Thrones," at Wimbledon on July 2, 2015 in London, England.

Sound the alarms, "Game of Thrones" fans, a major spoiler about the show might have just leaked.

Some fans may be doing a little victory dance about this possible season six leak, because it's about Jon Snow (Kit Harington). You know, the Night's Watchmen who was probably killed in the season five finale, but who may not be truly dead.

Kit Harington has been spotted near the "Game of Thrones" set in Belfast.

This could mean many things -- Harington could be visiting his friends who are still employed on the show, he could be filming a flashback or funeral scene a la Tywin Lannister (Charles Dance), he could even just be taking a holiday in Belfast. Or .. Jon Snow isn't dead after all, and every single "Game of Thrones" cast member lied right out. All of them.

The "Game of Thrones" fansite Watchers On The Wall posted paparazzi shots to Twitter of Harington arriving at the Belfast airport Tuesday (and on the same flight as his "Game of Thrones" costar Tom Wlaschiha), and fans are, of course, freaking out. HBO had no comment about the sighting, but Harington's proximity to the "Game of Thrones" season six production paired with the fact that he hasn't chopped off his Jon Snow hair yet like he threatened to do once his role was finished is a promising sign that we haven't seen the last of Jon on the show.